generics.h

/*
 * Copyright 2016, IST Austria
 *
 * This file is part of Limi.
 *
 * Limi is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Limi is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Limi.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef LIMI_DATASTRUCTURES_GENERICS_H
#define LIMI_DATASTRUCTURES_GENERICS_H

#include <ostream>
#include <functional>
#include <sstream>


typedef std::function<void(std::ostream&)> printable;

namespace std {
inline std::ostream& operator<<(std::ostream& os, const printable& p) {
  p(os);
  return os;
}

inline std::stringstream& operator<<(std::stringstream& os, const printable& p) {
  p(os);
  return os;
}
}

namespace Limi {

template< class Key >
struct independence;


template< class Key >
struct no_independence {
  inline bool operator()(const Key& a, const Key& b) const {
    return false;
  }
};

template< class Key >
struct printer_base {
  virtual ~printer_base() {}
  inline printable operator()(const Key& item) const {
    return [&](std::ostream& o) {print(item, o);};
  }
  
  virtual void print(const Key& item, std::ostream& out) const = 0;
};

template< class Key >
struct printer : public printer_base<Key> {
  virtual void print(const Key& item, std::ostream& out) const override {
    out << item;
  }
};

}

#endif // LIMI_DATASTRUCTURES_GENERICS_H